- N-heterocyclic carbene-catalyzed asymmetric synthesis of cyclopentenones
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N-Heterocyclic carbene-catalyzed asymmetric construction of cyclopentenones using enals and α-diketones is achieved, furnishing a series of highly functionalized cyclopentenones in a highly diastereo- and enantioselective manner. The protocol tolerates su
- Chen, Zhizhou,Kong, Xiangwen,Niu, Shengtong,Yang, Shuang,Liu, Jinggong,Chen, Bolai,Luo, Benlong,Zhou, Changyu,Ding, Chenglin,Fang, Xinqiang
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- A new ytterbium iodide mediated coupling of acyl cyanides and synthesis of 1,2-diketones
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Conversion of acyl cyanides 1 into 1,2-diketones 2 has been achieved by the action of ytterbium iodide in dry tetrahydrofuran at room temperature, in high yields.
- Saikia, Promod,Laskar, Dhrubojyoti D.,Prajapati, Dipak,Sandhu, Jagir S.
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p. 7525 - 7526
(2007/10/03)
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- Synthetic exploitation of the ring-opening of 3,4-dinitrothiophene. Part 7. Access to disubstituted 1,2,5-oxadiazole-2-oxides and 2-phenyl-2H-1,2,3-triazole-1-oxides
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1,4-Dialkyl- and 1,4-diaryl-2,3-bis(hydroxyimino)butanes 7, from reduction of the corresponding 1,4-disubstituted 2,3-dinitro-1,3-butadienes 2, are transformed with satisfactory yields into 3,4-disubstituted 1,2,5-oxadiazole-2-oxide 5 and 4,5-disubstitute
- Armani, Vania,Dell'Erba, Carlo,Novi, Marino,Petrillo, Giovanni,Tavani, Cinzia
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p. 1751 - 1758
(2007/10/03)
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- Darstellung und Molekuelstruktur des (μ-Alkylidenamido)titanocenkomplexes 2(μ->
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Reduction of (C5H5)2TiCl2 with Zn in presence of benzyl cyanide gives the (μ-alkylideneamido)titanocene complex2> with C-C bond formation between two benzyl cyanide molecules.X-ray structure investigation indicates a symmetrical structure.The C=N distances are smaller than usual, the Ti-N distances are very short, and the Ti-N-C angle differs only a little from 180 deg, which infers a heteroallene structure of the complex.
- Rehbaum, Frank,Thiele, Karl-Heinz,Trojanov, Sergej I.
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p. 327 - 333
(2007/10/02)
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- REACTIONS OF ACYL ANIONS GENERATED FROM ACID CHLORIDES AND DIIODOSAMARIUM
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Acid chlorides react with SmI2 to give α-diketones.Various experiments show that the initially formed acyl radical is rapidly transformed into an acyl anion which is thus generated by quite an unusual route.This species acylates acid chlorides, aldehydes and ketones in situ to give α-diketones and α-diketols.There are some limitations to this acyl anion chemistry but the reactions are realized with a good efficiency at room temperature in THF solution.
- Souppe, J.,Namy, J-L.,Kagan, H.B.
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p. 2869 - 2872
(2007/10/02)
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- FACILE SYNTHESIS OF BENZYL KETONES BY THE REDUCTIVE COUPLING OF BENZYL BROMIDE AND ACYL CHLORIDES IN THE PRESENCE OF A PALLADIUM CATALYST AND ZINC POWDER
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Benzyl ketones were obtained in good yields from benzyl bromide and acyl chlorides by the combined use of Zn and a palladium catalyst under mild conditions.
- Sato, Toshio,Naruse, Kouichi,Enokiya, Masashi,Fujisawa, Tamotsu
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p. 1135 - 1138
(2007/10/02)
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